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(2/3)*x+1 = 9/7 // - 9/7
(2/3)*x-(9/7)+1 = 0
(2/3)*x-9/7+1 = 0
2/3*x-2/7 = 0 // + 2/7
2/3*x = 2/7 // : 2/3
x = 2/7/2/3
x = 3/7
x = 3/7
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